Mini Ships

To unlock mini ships, go to the Extras screen, then go to Cheats. At this screen, move the rows of symbols to form this line: Circle, Square, Square, X, Circle.

Use All Weapons In Time Trial Mode

Enter "Cheats" in the main menu and enable the Infinite Weapons cheat (Triangle, Circle, X, Circle, Square). When you enter the Time Trial Mode, you will be able to use all weapons currently unlocked with infinite supply.